This tiny amplifier packs a serious full-range punch, delivering a staggering 100 watts to each of its four channels.NexD Technology: The breakthrough that makes this much power possible in such a small chassis is JL Audio's NexD ultra-high-speed switching design, which allows for full bandwidth Class D operation with extremely low distortion and outstanding efficiency.Combine with a subwoofer amp: Use the M400/4 in combination with the JL M600/1 monoblock to build a 1000 W amplification system to power four satellites and a subwoofer... and fit the whole thing under a seat. Or, use the M400/4 by itself to power two satellites, plus a subwoofer. With M-Series amplifier, the possibilities are endless.Filters: The M400/4 includes a 12 dB / octave filter for each channel bank, which can be configured as a low-pass or high-pass filter and offers continuously variable cutoff frequency selection from 50-500 Hz.Remote control: With the addition of an HD-RLC remote level control (sold separately), the amplifier's Ch. 1 & 2 level or overall level can be directly controlled from a remote location.Built for the marine environment: This marine amplifier features white and gray powder-coat finishes, a gasketed cover for the controls and stainless steel hardware for durability in the marine environment.Key FeaturesNexD amplifier technologies produce exceptional audio quality, unsurpassed total efficiency and high power from very compact amplifier designsJL Audio's exclusive Advanced Rollback Protection circuit monitors the amplifier's thermal condition and adjusts amplifier operation to eliminate annoying amplifier shut-down eventsFrequency Response: 12 Hz - 22 kHz (+0, -1dB)Signal/Noise Ratio, referred to highest rated power: >104 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)Signal/Noise Ratio, referred to 1 W: >84 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)Damping Factor @ 4 Ω: >150 / 50 HzDamping Factor @ 2 Ω: >75 / 50 HzTotal Harmonic Distortion + Noise @ Rated Power: <1% @ 2 Ω per Ch.Input Voltage Range @ RCA Inputs: 100 mV - 4 V RMSMin. Copper Power / Ground Wire Gauge: 4 AWG wireFuse Rating: 40 A (AFS, AGU or